The applicability of the N2 method to the estimation of torsional effects in asymmetric base‐isolated buildings

Koren, David; Kilar, Vojko

doi:10.1002/eqe.1064

Cited by 23 publications

(12 citation statements)

References 41 publications

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“…Because it provides accurate estimates for the target displacement of equivalent SDOF models, it can also be used for the determination of target displacements when using extended pushover‐based methods (e.g. ), which approximately take into account higher mode effects in elevation or, for example, extend the applicability of the pushover‐based method for seismic performance assessment of base‐isolated buildings.…”

Section: Discussionmentioning

confidence: 99%

A web‐based methodology for the prediction of approximate IDA curves

Peruš

Klinc

Dolenc

et al. 2012

Earthq Engng Struct Dyn

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SUMMARY A web‐based methodology for the prediction of approximate IDA curves, which consists of two independent processes, is proposed. The result of the first process is a response database of the SDOF model, whereas the second process involves the prediction of approximate IDA curves from the response database by using n‐dimensional linear interpolation. Such an approach enables user‐friendly prediction of the seismic response parameters with high accuracy. In order to demonstrate the capabilities of the proposed methodology, a web application for the prediction of the approximate 16th, 50th and 84th fractile responses of an RC structure was developed. For the presented case study, the response database was computed for a set of 30 ground motion records and the discrete values of six structural parameters. Very good agreement between the computed and the approximated IDA curves of the four‐storey RC building was observed. Copyright © 2012 John Wiley & Sons, Ltd.

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Section: Discussionmentioning

confidence: 99%

A web‐based methodology for the prediction of approximate IDA curves

Peruš

Klinc

Dolenc

et al. 2012

Earthq Engng Struct Dyn

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“…Moreover, the response of the superstructure may be substantially improved if the isolation system is torsionally flexible and if the center of stiffness of the isolated base lies in the vicinity of the (average) center of stiffness of the superstructure. Koren 2008 andKilar 2011 present and discuss the application of the N2 method to a one-way eccentric base isolated building. Comparisons of results with the average results of nonlinear dynamic analyses showed that the extended N2 method could, with certain limitations, provide a reasonable prediction of the torsional influences in minor to moderately asymmetric base-isolated structures.…”

Section: Base Isolationmentioning

confidence: 99%

Earthquake induced torsion in buildings: critical review and state of the art

Anagnostopoulos¹,

Kyrkos²,

Stathopoulos³

2015

Earthquakes and Structures

152

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The problem of earthquake induced torsion in buildings is quite old and although it has received a lot of attention in the past several decades, it is still open. This is evident not only from the variability of the pertinent provisions in various modern codes but also from conflicting results debated in the literature. Most of the conducted research on this problem has been based on very simplified, highly idealized models of eccentric one-story systems, with single or double eccentricity and with load bearing elements of the shear beam type, sized only for earthquake action. Initially, elastic models were used but were gradually replaced by inelastic models, since building response under design level earthquakes is expected to be inelastic. Code provisions till today have been based mostly on results of such models or on results from elastic multistory idealizations. In the past decade, however, more accurate multi story inelastic building response has been studied using the well-known and far more accurate plastic hinge model for flexural members. On the basis of such research some interesting conclusions have been drawn, revising older views about the inelastic response of buildings based on one-story simplified model results. The present paper traces these developments and presents new findings that can explain long lasting controversies in this area and at the same time may raise questions about the adequacy of code provisions based on results from questionable models. To organize this review better it was necessary to group the various publications into a number of subtopics and within each subtopic to separate them into smaller groups according to the basic assumptions and/or limitations used. Capacity assessment of irregular buildings and new technologies to control torsional motion have also been included.

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“…It is protected by a patent that has been filed at the Slovenian Intellectual Property Office (SIPO). The principle of the solution is analogous to that of sliding seismic base isolation systems [39][40][41][42][43][44][45][46][47].…”

Section: Description Of the Proposed Foundation Systemmentioning

confidence: 99%

Seismic Aspects of the Application of Thermal Insulation Boards Beneath the Foundations of Buildings

Koren¹,

Kilar²,

Azinović³

2016

Insulation Materials in Context of Sustainability

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In recent years, there has been a significant increase in the construction of energyefficient buildings. These buildings are mainly characterized by their thermal envelope, which needs to follow the complete outer perimeter of the building without any interruptions, to avoid thermal bridges. It has been observed, however, that the specific new details which prevent the occurrence of thermal bridges can, in many cases, substantially affect the structural integrity of such buildings during earthquakes. This chapter deals with the seismic aspects of the application of thermal insulation (TI) boards beneath the foundations of buildings. For this purpose, the mechanical characteristics of the most commonly used material in practice (i.e., extruded polystyrene-XPS) were experimentally determined. Additionally, the shear behaviour of differently composed TI foundation sets was investigated and their friction capacity estimated. The authors have proposed a new solution for the foundation detail, which is based on controlling the sliding mechanism between the individual layers of TI boards in order to reduce the seismic forces induced on the superstructure. The proposed detail with a specially designed sliding layer surface is made of commonly used TI materials for modern passive houses, thus reducing the potential additional costs. The solution was verified by means of nonlinear dynamic analysis of several realistic building models and various friction coefficients between XPS boards. The selected results are presented in terms of fragility curves for the occurrence of sliding between the layers of XPS boards. Based on these curves, the desired seismic response scenario and level of protection of a building structure could be selected.

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The applicability of the N2 method to the estimation of torsional effects in asymmetric base‐isolated buildings

Cited by 23 publications

References 41 publications

A web‐based methodology for the prediction of approximate IDA curves

A web‐based methodology for the prediction of approximate IDA curves

Earthquake induced torsion in buildings: critical review and state of the art

Seismic Aspects of the Application of Thermal Insulation Boards Beneath the Foundations of Buildings

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